frame: Add "get_corner_radiuses" chain

https://bugzilla.gnome.org/show_bug.cgi?id=628195

upstream commit:
https://gitlab.gnome.org/GNOME/metacity/commit/3994d7a0

6 files changed, 83 insertions, 0 deletions

diff --git a/src/core/frame-private.h b/src/core/frame-private.h
index d7183149..811ac624 100644
--- a/src/core/frame-private.h
+++ b/src/core/frame-private.h
@@ -59,10 +59,17 @@ void     meta_frame_queue_draw              (MetaFrame  *frame);
 
 MetaFrameFlags meta_frame_get_flags (MetaFrame *frame);
 
+void meta_frame_get_corner_radiuses (MetaFrame *frame,
+                                     float     *top_left,
+                                     float     *top_right,
+                                     float     *bottom_left,
+                                     float     *bottom_right);
+
 gboolean meta_frame_sync_to_window (MetaFrame         *frame,
                                    int               gravity,
                                    gboolean          need_move,
                                    gboolean          need_resize);
+
 cairo_region_t *meta_frame_get_frame_bounds (MetaFrame *frame);
 
 void meta_frame_set_screen_cursor (MetaFrame        *frame,
diff --git a/src/core/frame.c b/src/core/frame.c
index b6ed741e..a2da9cb9 100644
--- a/src/core/frame.c
+++ b/src/core/frame.c
@@ -338,6 +338,19 @@ update_shape (MetaFrame *frame)
     return FALSE;
 }
 
+void
+meta_frame_get_corner_radiuses (MetaFrame *frame,
+                                float     *top_left,
+                                float     *top_right,
+                                float     *bottom_left,
+                                float     *bottom_right)
+{
+  meta_ui_get_corner_radiuses (frame->window->screen->ui,
+                               frame->xwindow,
+                               top_left, top_right,
+                               bottom_left, bottom_right);
+}
+
 gboolean
 meta_frame_sync_to_window (MetaFrame *frame,
                            int        resize_gravity,
diff --git a/src/include/ui.h b/src/include/ui.h
index 40ae03cf..26d0d462 100644
--- a/src/include/ui.h
+++ b/src/include/ui.h
@@ -102,6 +102,13 @@ cairo_region_t *meta_ui_get_frame_bounds (MetaUI *ui,
                                           int     window_width,
                                           int     window_height);
 
+void meta_ui_get_corner_radiuses (MetaUI *ui,
+                                  Window  xwindow,
+                                  float  *top_left,
+                                  float  *top_right,
+                                  float  *bottom_left,
+                                  float  *bottom_right);
+
 void meta_ui_queue_frame_draw (MetaUI *ui,
                                Window xwindow);
 
@@ -111,6 +118,7 @@ void meta_ui_set_frame_title (MetaUI *ui,
 
 void meta_ui_update_frame_style (MetaUI *ui,
                                  Window  window);
+
 void meta_ui_repaint_frame (MetaUI *ui,
                             Window xwindow);
 
diff --git a/src/ui/frames.c b/src/ui/frames.c
index 18539e19..37bf6cc0 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -806,6 +806,40 @@ meta_frames_get_borders (MetaFrames       *frames,
   borders->visible.right *= scale;
 }
 
+void
+meta_frames_get_corner_radiuses (MetaFrames *frames,
+                                 Window      xwindow,
+                                 float      *top_left,
+                                 float      *top_right,
+                                 float      *bottom_left,
+                                 float      *bottom_right)
+{
+  MetaUIFrame *frame;
+  MetaFrameGeometry fgeom;
+
+  frame = meta_frames_lookup_window (frames, xwindow);
+
+  meta_frames_calc_geometry (frames, frame, &fgeom);
+
+  /* For compatibility with the code in get_visible_rect(), there's
+   * a mysterious sqrt() added to the corner radiuses:
+   *
+   * const float radius = sqrt(corner) + corner;
+   *
+   * It's unclear why the radius is calculated like this, but we
+   * need to be consistent with it.
+   */
+
+  if (top_left)
+    *top_left = fgeom.top_left_corner_rounded_radius + sqrt(fgeom.top_left_corner_rounded_radius);
+  if (top_right)
+    *top_right = fgeom.top_right_corner_rounded_radius + sqrt(fgeom.top_right_corner_rounded_radius);
+  if (bottom_left)
+    *bottom_left = fgeom.bottom_left_corner_rounded_radius + sqrt(fgeom.bottom_left_corner_rounded_radius);
+  if (bottom_right)
+    *bottom_right = fgeom.bottom_right_corner_rounded_radius + sqrt(fgeom.bottom_right_corner_rounded_radius);
+}
+
 #ifdef HAVE_SHAPE
 static void
 apply_cairo_region_to_window (Display        *display,
diff --git a/src/ui/frames.h b/src/ui/frames.h
index 0af5ed89..cde51e60 100644
--- a/src/ui/frames.h
+++ b/src/ui/frames.h
@@ -144,6 +144,14 @@ cairo_region_t *meta_frames_get_frame_bounds (MetaFrames *frames,
                                               Window      xwindow,
                                               int         window_width,
                                               int         window_height);
+
+void meta_frames_get_corner_radiuses (MetaFrames *frames,
+                                      Window      xwindow,
+                                      float      *top_left,
+                                      float      *top_right,
+                                      float      *bottom_left,
+                                      float      *bottom_right);
+
 void meta_frames_move_resize_frame (MetaFrames *frames,
 				    Window      xwindow,
 				    int         x,
diff --git a/src/ui/ui.c b/src/ui/ui.c
index 070bf127..0639757d 100644
--- a/src/ui/ui.c
+++ b/src/ui/ui.c
@@ -302,6 +302,19 @@ meta_ui_get_frame_borders (MetaUI *ui,
   meta_frames_get_borders (ui->frames, frame_xwindow, borders);
 }
 
+void
+meta_ui_get_corner_radiuses (MetaUI *ui,
+                             Window  xwindow,
+                             float  *top_left,
+                             float  *top_right,
+                             float  *bottom_left,
+                             float  *bottom_right)
+{
+  meta_frames_get_corner_radiuses (ui->frames, xwindow,
+                                   top_left, top_right,
+                                   bottom_left, bottom_right);
+}
+
 static void
 set_background_none (Display *xdisplay,
                      Window   xwindow)